Transformer-tank cover



Nov. 27, 1923 v. BINGAY TRANSFORMER TANK COVER Filed Aug. 10; 1920Patented Nov. 27 1923},

I hairs "7st";

ROBERT TRANSFORMER QOMPANY, ;A iCOBPQRfATION' OF PENNSYLVANIA..

\ 'rnansromyrnmmnx oovnav Application filed AngustllO, 1920. Serial No.402,568.

To all whom it may concern Be it known that I, Bonner V. BINGAY, acitizen of the United States, residing at Pittsburgh, in the county ofAllegheny and State of Pennsylvania, have invented-mer tain new anduseful Improvements in Transformer-Tank Covers, of which the followingis a specification.

This invention relates to tanks for electric transformers of the oilcooled type and particularly to a cover for such a tank. The chiefobject of the invention is to provide a flexible cover of sheet steel,preferably steel, which will be inexpensive to form and ofgreat'strength. n

Further objects of the invention in crowning the top and providing itwith openings to the interior'of the tank will appear from the followingdescription taken in connection with the accompanying drawings, inwhich-- Figs. 1, 2 and 3 are diagrammatic views illustrating theformation of a cover. Fig. 4: is a plan view of a cover embodying theinvention, and

Fig. 5 is an elevational view of the same. In the embodiment of theinvention shown in the drawings the cover is particularly adapted for atransformer tank of the ty e illustrated in my copending application ierial No. 386,115, filed June 2, 1920. In the formation of the cover arectangular blank 10 of sheet steel is cut into circular form 11 (Fig.l) and then has one or more segmental portions 12 cut out of it from thecircular edge to a point 13 spaced from the center.

The flat disk is then arched or crowned, as

by rolling for instance, till its form is convex on the exterior surfaceand concave on the interior surface and the edges of the cut 12 arebrought together (Fig. 3). These edges are then clamped and tightlywelded to retain the cover in arched form. This arched form strengthensand rigidities the structure and gives a pleasing crowned appearance tothe transformer tank and also acts to shed rain and moisture. Thecrowning produced by the method of this invention gives an arch to thecover in all directions symmetrical about the axis of the tank and alsosymmetrical with relation to both the longiturli nal and transverse axisof the cover in case the latter is oblong or oval in form.

After this arching of the cover the centcr s then cut out for thecircular man-bole 15 and holes 16 are also cut for the ends of thetransformer lifting rods and holes 17 for the high tension leads. Therectangular opening 20 is also cut for the slab supporting the lowtension leads and all of these openings are provided with fia ngedextensions 21, 22, 28, 24, as shown, to serve as fastening means forbushings or parts covering the openings. These extensions are preferablywelded in place and the edges of the opening 12 are also completelyclosed and welded at 25.

The edge of the cover has holes 26- for the clamp bolts fastening thecover onto the transformer tank body. Extensions 30 may be Welded inplace overhanging the edge of cover and having openings 31 for upperends of the lifting rods from the base on which the transformer tanksets. In assembled v, .BINGAY, onrmrseunerr," PENNSYLVANIA ASSIGNOR T0PITTSBURGH position the transformer frame rods passing a throughopenings 16 have nuts turned to press upward on the under side of saidcover so that the higher central portions of the cover are pressedupward while the lower edge portions are held downward bythe clamping t0the tank body. The cupped or crowned shape of the cover adapts it tothese stresses and also gives a strong arched shape and acts to shedmoisture and ram.

The cover of this invention being of sheet steel is light in weight. andthe method of formation by cutting from stock sheets is inexpensive andeasily adapted to a variety of sizes and types of tanks. The finallycompleted cover while strong is at the same time flexible enough at theedges to accommodate itself to the top rim of the tank body.

While this invention has been illustrated in connection with a circulartank. it is adaptable also to tanks of other shapes. such as oval orangular. and the invention is not confined to the specific emlmdimentshown, but is intended to cover such modifications thereof as comewithin the scope of the following claims.

I claim:

1. A transformer tank cover comprising an integral plate of sheet steelof comparatively shallow dish shape haring'thc interior surface concaveand the exterior surface convex giving 'an arched form to the bodyportion of the cover in all directions. and

I depth terminating an integral Plate of sheet steel having e se mentalportion cut out and. the edges'of t e cut welded together and having theinteriorsurface concave and the exterior surface convex giving an archedform to the body portion of the cover in ail directions, and having theedgesfiexible for adapting the under surface to fit the top rim of thetransformer tank, the radial depth of the segmentel portion being lessthan the radial depth of the coverat' that point.

3. A, trensformer'tank cover comprising an integral piate of sheet steelhaving at central opening cut in the sheet and a flanged extensionfastened thereto, and hav ing a segmental portion cut out to a radialshort of said central ereeee o enin and the ed es of? the cut Weldedtogether, the main body portion of the cover being of arched form in alldireetions having its interioreurfece eeneeve and exterior surfaceconvex, and having the edges flexi hie for edepting the under surface tofit the top rim of the transformer tank.

i. The method offorming e transformer tank cover from a steel sheet,coniprisiing cutting a eegment therefrom, bending the body portion ofthe sheet to give the interior surface a concave and the exterior: stirface a convex arched form in all direc tions and forcing the edges ofthe out to gather, end fastening said edges together,

RGBERT V. BENGAY

